Stack Overflow is not a social networking site. It's not going to become a social networking site. Jeff has been pretty clear on this.
Listen to the latest podcast (1:00:52):
Jeff: ... I kind of like having control over what I think the
product is and what we're building and the direction of it, and I don't want
to be pulled in like ten different directions in terms of "Hey let's make it
a social networking site" - that would be like a horror story for me - that's
everything I don't want, right? But if you open source, somebody could fork you
and say "You know what, I'm going to make the ultra-social Facebook version of Stack Overflow" - I'm getting an ulcer just thinking about this actually - where you can friend people and, you know, you can send little private messages to each other and it's all about hanging out and being buddies - it's horrible!
Joel: Don't give 'em any ideas.
I understand that what you're asking for isn't quite that, but it's pretty darned close - and would almost certainly be used in that way, even if it was really designed for just time-sensitive quick programming-related questions/updates.
Nope, I can't see this happening...